Chock for ships&#39; boats



July 19, 1932.

J. s. BARCLAY CHOCK FOR SHIPS BOATS Filed Feb, 2l, 1931 M0@ @TTM/viv Patented July 19, 1932 UNITED STATES PATENT ori-ICEv JOHN SYDNEY BARCLAY, OF LONDON, ENGLAND, ASSIGNOR T'O BARCLAY DAVIT COM- PANY LIMITED, OF LONDON, ENGLAND, A COMPANY OF GREAT BRITAIN CHOCK FOR SHIPS BOATS Application led February 21, 1931, Serial No. 517,609, and in Great Britain February 27, 1930.

This invention relates to ships davits, and has for its object to provide an improved construction of chocks for supporting a'boat after it has been lifted and whilst it is being housed.

The invention is more particularly applicable to davits of the kind known as gravity or automatic davits in which the inboard and outboard movements of the davits in which the boat is supported are controlled or fitted automatically by the winding-in or paying-out of the falls. In practice it is found that the arms of such davits always have a. slight fore-and-aft play and as the boat is normally supported from the davit head a considerable longitudinal movement is imparted to the boat by any pitching movement of the vessel or ship by which it is carried. The gripes usually employed when stowing a boat effectively restrain any lateral movement of the boat, but they do not pre# vent this longitudinal movement so that chafing and serious damage to the boat may occur.

According to the present invention there is provided a chock operated in such a manner that the inboard movement of the davit arm. its carriage or a part associated with the davit arm causes the chock to engage with and support the boat. The chock may be associated with means for securing a boat, the arrangement being such that when the securing means for the boat are released, the weight of the boat serves to move the chock into its disengaged position.

By means of the present invention the falls are substantially relieved of the weight of the boat and in order that the boat may be secured in position so as to prevent both longitudinal and lateral movement thereof it is secured by gripes which may be passed around the boat. The chock is preferably also so arranged that when the boat is adapted to be lowered over the side of the ship, the release of the chock will cause an initial impetus to be imparted to the davit for its outward movement by reason of the action of the weight of the boat on the chock. In actual practice one or two chocks are provided at each end of the boat, whilst one or more chocks may also be provided at intermediate positions.

The invention will now be described with reference to the accompanying drawing show-v ing various forms of construction in accordance with'the present invention.

Figure 1 shows an end elevation of a davit fitted in accordance with the invention.

Fig. 2 shows a plan view of a preferred` Fig. 8 shows a side elevation of another modified form of chock.

Fig. 9 shows a side elevation of still an other modified form of chock.

Fig. 10 shows a sideA elevation of a still further modification of a chock and Fig. 11 shows a side elevation of still another modification of a chock.

In Figure 1 the invention is shown as applied to davits as described for example in specification of application Serial No. 398,368 filed 9th October 1929. These davits comprise a run-way 1, which slopes upwards inboard from the side of the ship, and a davit arm 2 is adapted to travel along the run-way by the winding-in or paying-out of the falls 3 after the boat has reached the davit head 4, and a pin 5 on a supporting member 6 attached to the boat 'i' has been engaged with a hook shaped member 8 which is provided inv the usual manner on gravity davits.

To the run-way 1 is secured a bracket 9 Y which projects slightly from the lower side of the run-way, and has pivoted thereto at 10 an upwardly extending lever 11 which at its upper end carries a chock 12. The lever 11 is inclined in an outboard direction and is provided with a lateral projection 13 as shown in Figure 2 which is arranged in the path of a roller 14 mounted on the davit arm 2, so that when the davit arm is moved in an inboard position the lever 11 is rocked from the chain dotted position into the full line position in which it engages with the keel of the boat so as to lift and support the latter. The projection 13 may also serve to limit the movement of the lever 11 in the outboard direction.

rlhe lever 11 is arranged in such a position that just before the boat 7'reaches the full inboard position it engages with the keel of the boat so that from this moment.

until the boat reaches the full inboard position the chock 12 takes the weight of the boat so that it is not entirely suspended from the davit head. In practice the whole weight of the boat 7 is taken up by one ormore chocks arranged at the ends of the boat, and if desired in any intermediate po-sition when the For the purpose of adjusting the period.

when the chock' comes into' operation there is mounted in the projection 13 a screwY spindle 15' having a head1-6 for cooperating with the roller 14;. For the purpose" of.' adjustment'the-spindle 15 isprovided with a square head 17 for engagement by a spanneror other suitable tool: and it is locked iny theV adjusted position by means ofa lock. nut 18.`

With the arrangement as above described the chock and its operating mechanism do not interfere with' the automatic or gravity release of the davit andl lowering of the boat. In fact they weight of the boat actingupon the chock tending to return it to its normal position applies pressure to the davit arm which assists in starting` it upon' its outboard movement when the falls 3 arev released..

ln' the example of construction as above described the chock is held in its operative position by the securing of thev gripes.

As shown in Figure 1, one end of the gripe 19 is connected to the run-way 1 by means of a rigl'it and left-hand adjusting swivel* 20,

whilst the' other end is engaged with a hoek 21 formed on a lever 22 pivoted at 23 in a bracket24 secured to the run-way 1. When the davit arm 2 is in its full inboard position a stop 25 thereon comes into the path of the vleverV 22 so that when this lever is secured in position it prevents the davit arm from moving outboard.

The free end of the lever 22 is connected by a cable or the like 26 to the run-way 1 through c" the medium of a release device 27.- This revspecifications above referred to.

lease device preferably consists of a link 23 to which is hinged'a prong 29 adapted to be engaged by a ring 30. The prong preferably engages with a link 31 connected by a cable or the like 32 attached to an eye bolt 33 paseing through a lug 34 providedon a bracket 35 secured to the run-way 1` The eye bolt y may be adjusted for the purpose of tensioning the cable 26 or the like by means of a nut 36 providedwith one or more wings or handles 37. In order to prevent the cable or the like 26 from falling towards the deck of the boat7 and thus obstructing the passage-way over the deck7 a guard-cable or` the like 38 is provided of which one end is attached to the eye bolt 33 and the other end tothe cable 26.

With the arrangement as above described there are certain essential movementsvor operations consisting of (a) hoisting the boat by means of a winch7 the inboard movement of the davit arms which may be independent or may beeected automatically by y the falls, and (c) the fitting, and securing of the gripes. These operations are effected in theorder stated for thehoisting and housing of the boat and in the-reverser order for loweringthe boat.

Assuming for example that it is desired` to lower the boat 7 .fromtheposition shown in Figure 1. The release device 27 isdisengaged byslipping the ring 30 from the end of the prong. 2.9 sothat the latter isdisen gaged from-thelink 31.. The lever 22 is thus free to rock. onits pivot 23 soithat thev gripe 19 is disengaged fromthe hook.21, Whenzthe falls are released the Weight of the boat actring onrthe chock 12 causes theA lever 11 to rock,

on. its pivot 10 whereby the lateral projection` 13 or the head 16 of the screw spindle 15 acts against the roller 14 imparting an initial. impetus in the outboard movement to the davit arm.2. llhe davit, arm with the boat then moves to the fullV outboard position and the boat is lowered as described in` the prior specications above referred to.

For the purpose of raising the boat and housing it the boat is irst raisedandy the davit armv with the boat isV then moved in the inboard direction as describedl in the prior Shortly before the boat reaches the inboard position the roller 14 comes into engagement with the lateral projection 13 or the head 16 of the screw spindle 15 and rocks the lever 11 on its pivot 10 whereby the chock 12 is brought into engagement with the Vkeel of the boat 7, thus raising vthe latter and taking theV Vhen the boat is in the fullfinboard posi- V dependently of the falls and both lateral and vlongitudinal movements of the boat are prevented.

As Will be seen from the example of construction as above described the chock moves along a path which differs from the path of movement of the boat, for example the chock moves along a rotary path having its centre at the pivot 10, Whilst the boat moves along ya straight line. Movement of the'chock is a path different to that of the boat may also be obtained with the arrangement as shown in Figure 3. In this ligure a separate track 39 is secured to the run-Way l and on this track is adapted to run a carriage 40 provided With Wheels 41 and carrying the chock 42. Suitable means are provided for limiting the downward movement of the carriage 40, for example by curving upwardly the end of the track 39 as indicated at 43. In this case the roller 14 provided on the davit arm 2 comes into engagement With the carriage 40 shortly before the boat reaches its inboard position and thus raises the chock 42 into engagement With the keel of the boat so that on the further inboard movement of the boat the latter is raised by the chock 42.

In Figure 4 is shown a further mcdicatior. in which a bell crank lever 44 is pivoted at 45 to the run-Way 1, this lever carrying a chock 46 adapted to be brought into engagement with the keel of the boat just before this reaches the inboard position by means of a pin or roller 47 secured to the davit arm 2 or to a carriage on Which the davit arm is mounted.

As shown in Figure 5 the bell crank lever n in Figure 4 may be replaced by a lever 48 vpivoted at one end at 49 to the run-Way 1, 'Whilst a roller or projection 50 on the davit the keel as above described. 45

As shown in Figure 6 a bell crank lever 52 may be pivoted at 53 to the davit arm 2 or its carriage, one arm of the bell crank lever 52 being provided with the chock 54, Whilst the other end of the lever carries a `roller 55 'adapted to co-operate with a track 56 'provided on the run-Way 1, or separate therefrom so as to operate the chock 54 as above described. As shown in Figure 7 the roller 55 may be omitted, Whilst a stop or roller 57 is provided on the run-Way 1 so as to operate the chock in the same manner as the track 56 in Figure 6. l

In the modification shovvn in Figure 8 the ,chock 58 is carried by a rod 59 mounted for 'vertical sliding movement in the davit arm 2 or its carriage, this rod carrying at its lower end a roller 60 for co-operation with a cam track 61 provided on the run-vvay 1 and having the same action as the cam track 56 in Figure 6.

Figure 9 shows a modification in Which a chock 62 is carried by a rod 63 capable of vertical movement in the davit arm 2 or its carriage, the rod 63 being actuated by a cam or eccentric 64 Which is actuated through the medium of a lever 65 and link mechansm 66. The lever 65 is actuated by a stop or pin on the davit arm 2 or its carriage. The lever 65 may in some cases be replaced by the lever 22 shown in Figure 1 in which case this lever is arranged in the path of a pin or projection on thel davit arm or its carriage. Insuch a case the end of the gripe 19 is detachably connected to the member 22 so as to enable it vto be passed around the boat Without destroying the resulting action When releasing the gripe as described in connection With Figure 1.`

It Will be understood'that the cam may be of any suitable shape in order to produce the desired result.

Figure 10 shovvs a modification of the arrangement shovvn in Figure 9. In Figure 10 a toggle mechanism 67 is provided for operating the rod 63 carrying the chock 62,.

Figure 1l shovvs a further modification of Figure 9 in which the rod 63 is provided with a notch or teeth at 68 for engagement by the hooked end 69 of a bell crank lever 70 pivoted at 71'to the run-Way 1 and actuated by the link mechanism 66.

The chocks at opposite ends of the boat andv any intermediate chock that may be provided may be interconnected so as tol be operated simultaneously., In actual practice, hovvever, it is preferred to arrange the chock to be operated separately. v

'Whilst the invention as above described is mainly applicable to gravity or automatically operated davits, it Willl be undertood that it may also be applied to lufling davits.

1. In combination with a davit arm for a boat, a chock, operating means associated With said davit arm,*said operating means serving to actuate said chock When the boat is substantially in its inboard 'position so as to cause the said chock to engage with and support said boat, and gripes for securing said boat, a track for said davit arm, a lever pivotally mounted on said track, one end of said gripesbeing attached to said track,

Whilst the other end of said gripes is detachably connected to said lever after said gripes have been passed 'f around said boat, and means for attaching said lever to a liXed point of said track,the arrangement being `such that Whilst the lever is attached to the fixed point release of the gripes and movement of the chock is prevented, Whilst vvhen the lever is released the Weight of the boat acts on the chocks and initiates the outboard movement of the said davit arm.

2. Ina gravity davit the combination with a davit arm for supporting a boat and a track for said arm, ofa chock slidably if said chock is moved vertically it engages and combined actuating, vseciiring V and revleasing means forfsaid chock carried by said track, the arrangement being such thatkvvhe'u With and supports the boat andis locked in this position, `Whilst Whenrele'asedit is moved into its disengaged position by thevveightf of the boat restingv thereon.

3. In a gravity davit the combination With a track and a davit arm slidably mounted on said track of a chock mounted for` vertical,v sliding movement on said trac-k, a leverpivotally mounted onv said track, operating mechanism associated With said chock, andI means connecting said mechanism to said lever, the arrangement being such that when said lever is actuated the'operating mechanism moves the chock so as tocause it to engage with and support a boat. 4, In a gravity davit a combination With a track and a davit arm for supporting a boat slidably mounted on said track, ofy a chock carried by said track and adapted to move in a path which differs fromr and meets the path of the boat during the inboard movement of the latter, and means Whereby'said chock is actuated when the davit arm approaches its inboard movement so as to move the chock into a position in which it engages with and supports said boat.

5. In a gravity davit 'the combination With a track and a davit arm fors'upporting a boat slidably mounted onsaid track of bell crank lever. pivotally mounted on davit arm, a chock carriedr byY one arml of said lever, and a fixed stop on saidtrack, the` arrangement being suchy that When'during the inboard movement. of the said davit. arm the bell crank lever. comes into engagement With said stop, the said chock is/moved into engagement With the boat so as'tofs'upport the latter. Y 6. In a gravity davit the combination With a track and a. davit arm tor supporting'a boat slidably mounted on` said track, of. a lever pivotally mounted'onl said track, a chock carried by said lever, and an operati ing member carried by said davit arm for cooperation With said lever, the arrangement being such that When the davitarm'has nearly approached its full 'inboard position the said lever is actuated and moves the 'said chock into engagement With the boat sol ast'o support the latter. y i i' 7. In a gravity davit a combination with a track and a davit arm for vsupporting a boat slidably mounted on said track, of a cam track on said track, a chock carried by said davit arm, and a roller on said chock lco-opyerating With said cam track, the arrangement being such that When the roller engages with said cam track the said chock is'inoved into a position so as to'engage Withand support the said boat.

1,8 saone of. said gripes'bein'g attached to said track, n

the other'endof saidr'gripes being ldetachably connected to said secondv mentioned lever, and mea-nsufor securingsaid second'mentoned-l lever infposition when the gripes are engaged therewith, thearrangenient being such that'lasV4 the davit arm approaches its inboard position the chock is moved into engagement Withl theboat, "lifting and supporting the' latter sov as to render it free from'support by the davit arm and When secured, bythe gripes the'said boat'is prevented from lateral and longitudinal'movement, Whilst'when the securingmeans forthe second Vmentioned lever` l are released the gripes are released from the second mentioned lever and the boat acts on4 the chock by its' Weight, whereby the chock is moved into its disengaged position and the adjustable stop on the'lever by Which itis carried presses againsty the roller on the davit arm so asl to impart an initial impetus to the latter for commencing its outboard movement.

9. In combination with a davit arm for a boat, a chock mounted for movement adjacent theinboard position of said davit arm and said boat, actuating means for said chock, said chock when in its inoperative position being out. of the path of movement ofsaid boat, said chock When operated being moved into engagement with the keel of said boat and lifting said boat so as to take the Weight thereof and relieve the davit arm Vof saidvveight, land means for securing said chock in the pO- sition in Which ittakes the Weight of the boat.

10. In combination with a davit arm for a boat, a chock mounted for movementfadj acent the inboard position yof said davit arm and boat, actuating means for said chock, said chockbeing arranged to engage v vith the keel of said boat When said boat is in its inboard position whereby the said boat is lifted and the Weight thereof is taken from the davit arm, means for securingy saidA boat in its lifted position, and co--operating means between said chock and said davit arm, the arrangej ment being such that Wh en the Vsecuring means for the boat are released the Weight' of the boat acting on the chock serves, through the medium of said co-operating means, to impart an initial impetus to said davit arm forl initiating the outboard movement ofv said davit arm.

l1. In combination a track, a davit arm for a boat mounted for sliding movement on said track, a keel chock movably mounted on said track adjacent the inboard position of said davit arm, and a member carried by said davit arm, the arrangement being such that when said davit arm has substantiallg;7 reached its inboard position the member on said davit arm moves said chock into a position in which it engages With the keel of the boat and lifts the latter.

12. In combination a track, a davit arm for a boat mounted for sliding movement on said track, a keel chock movably mounted on said davit arm, and a member on said track for co-operation With said chock, the arrangement being such that When the davit arm approaches its inboard position the said chock is actuated by said member and is brought into engagement With the keel of the boat so as to lift the latter.

13. In combination with a davit arm for a boat, a chock mounted for movement during their board and outboard movement of said davit arm and said boat, actuating means for said chock, said chock When in its inoperative position being out of the path of movement of said boat7 said chock during the inboard movement of said boat being moved into engagement with the keel of said boat and lifting said boat so as to take the Weight thereof and relieve the davit arm of said Weight, means for securing said chock in the position in which it takes the Weight of said boat, said chock moving into its inoperative position during the outboard movement of said boat.

14. In combina-tion a track, a davit arm for a boat mounted for inboard and outboard movement on said track, a keel chock associated with said davit arm, and means on said track so disposed that during the inboard movement of said davit arm said chock is brought into engagement with the keel of the boat and lifting said boat so as to take the Weight thereof and relieve the davit arm of said Weight.

JOHN SYDNEY BARCLAY.

CERTIFICATE 0F CRRECTIN.

Patent Ne. 1,868,043 July 19, 1932.

.EQHN SYDNEY BRCLAY.

it is hereby certiiied that the above numbered patent was erroneousif; issiae to "Barclay Davit Company Limited, of London, England, a corporation of Great Britain," as owner of the entire interest in said invention whereas said patent should have been issued to the inventor seid oiin Sydney Barclay, and The Barcay Davit Company Limited, of legalen, England, a corporation of Great Britain, as assignee of oneiiait' "siere" or the exclusive right to said invention as shown by the records ci assignments in this ofice; and that the said Letters Patent shot-titi be read with this correction therein that the same may conform to the record o the case in the Patent Ctiice.

Signed and seaied this 15th day of November, A. D. 1932.

M. J. Moore, (Seat) Acting Commissioner o Patents. 

